import java.util.InputMismatchException;
import java.util.Scanner;

/**
 * @author gao
 * @date 2025/6/5 20:15
 */

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNext()) {
            try {
                int a = in.nextInt();
                int b = in.nextInt();
                System.out.println("sum = " + Add(a,b));
            } catch (InputMismatchException e) {
                System.out.println("Incorrect input: two integer is required");
                in.nextLine();
            }
        }
    }

    public static int Add(int x,int y) {
        return x + y;
    }
}
